how to remove key from object javascript code example

Example 1: javascript delete key from object

let person = {
  firstname: 'John',
  lastname: 'Doe'
}

console.log(person.firstname);
// expected output: "John"

delete person.firstname;

console.log(person.firstname);
// expected output: undefined

Example 2: how to remove key value pair from object in javascript

delete object.keyname;

Example 3: javascript remove object key

var obj = {a: 5, b: 3};
delete obj["a"];
console.log(obj); // {b: 3}

Example 4: nodejs delete object key

delete obj.firstname;

Example 5: js Property Assignment delete

delete objectName['Property Name'];
delete objectName.propName;